In the diagram, $BCD$ is a straight line. $BC=10$ cm, $AC=6$ cm and \(\cos \angle ACD = -\frac

Question

In the diagram, $BCD$ is a straight line. $BC=10$ cm, $AC=6$ cm and $\cos \angle ACD = -\frac{11}{24}$. Find the value of $\cos \angle ACB$, the value of $x$, $\angle BAC$.

Accepted Answer

(i) $\frac{11}{24}$ (ii) $9\text{ cm}$ (iii) $80.9^\circ$

Fundamental Principles of the Cosine Rule

Fundamental Principles of the Cosine Rule

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